which allows the interaction between the water and turbine to be visible whilst providing protection for the generator and instru- mentation from the water spray. A single sealed bearing in this cas- ing supports the turbine output shaft. The casing is braced by a steel frame from which the generator is suspended. All of the gen- erator weight is supported by the frame, not by the output shaft bearing. The jet inclination angle, a1, is set using an adjustable noz- zle steel support structure bolted onto the frame (not shown in Fig. 7, see Fig. 9). The turbine torque is measured through an inline torque trans- ducer between the turbine and generator. An Oldham coupling al- lows for a small amount of misalignment between the torque transducer and the turbine output shaft. The speed of the turbine is measured from the frequency of the output current from the generator. The head at the nozzle is measured from the flow rate through the system. Assuming no penstock losses and the nozzle Cd set to 1, the velocity through the nozzle v1 can be calculated for the desired head using (1). Then, using (2), the flow rate through the nozzle can be calculated from this. This flow rate is measured up stream of the nozzle using an electromagnetic induc- tion flow meter. The jet is aligned with the cups using a laser aligned with the centre-line of the nozzle orifice. A grid on the cup facilitates this alignment, Fig. 8. The jet inclination angle a1 is measured between the fixed structure and adjustable nozzle support structure.